Relationships between molecular and plane-stress essential work of fracture parameters in amorphous copolyesters

J. Karger-Kocsis, E. J. Moskala

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37 Citations (Scopus)

Abstract

The plane-stress fracture toughness of amorphous copolyester (aCOP) sheets of different intrinsic viscosity (IV) was determined by the essential work of fracture (EWF) concept using tensile-loaded deeply double-edge notched (DDEN-T) specimens. It was found that the specific essential work of fracture (we) is a composite parameter: its constituents are relied on yielding (we, y) and necking (we, n), respectively. The we values, and especially we, y did not change as a function of IV. This finding along with the fact that the mean entanglement length of the aCOP series was constant, suggest that we, y (which is related to the critical plane-strain toughness value) is likely dependent on the entanglement network. This assumption was reasoned by the observation that the plastic zone was completely recovered after annealing the specimen beyond the glass transition temperature (Tg). Recall that the shape recovery in case of cold-drawing (i.e. deformation below Tg) is controlled by the initial entanglement network structure in amorphous polymers.

Original languageEnglish
Pages (from-to)503-510
Number of pages8
JournalPolymer Bulletin
Volume39
Issue number4
Publication statusPublished - Oct 1997

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plane stress
cold drawing
viscosity
plane strain
toughness
fracture strength
Viscosity
glass transition temperature
plastics
recovery
Toughness
annealing
composite materials
Fracture toughness
Polymers
polymers
Annealing
Plastics
Recovery
Composite materials

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

Cite this

Relationships between molecular and plane-stress essential work of fracture parameters in amorphous copolyesters. / Karger-Kocsis, J.; Moskala, E. J.

In: Polymer Bulletin, Vol. 39, No. 4, 10.1997, p. 503-510.

Research output: Contribution to journalArticle

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